.container {
  position: relative;
  margin: 0 auto;
  width: 1000px;
  height: 300px;
  overflow: hidden;
  text-align: center;
}

.container:hover .arrow {
  display: block;
}

.container .wrapper {
  position: absolute;
  top: 0;
  left: 0;
  width: 6000px;
  height: 100%;
  overflow: hidden;
}

.container .wrapper li {
  float: left;
  width: 1000px;
  height: 100%;
}

.container .wrapper li img {
  display: block;
  width: 100%;
  height: 100%;
}

.container .focus {
  display: inline-block;
  position: relative;
  z-index: 999;
  top: 270px;

  padding: 4px;
  font-size: 0;
  background: rgba(0, 0, 0, 0.3);
  border-radius: 20px;
}

.container .focus li {
  display: inline-block;
  margin: 0 4px;
  width: 12px;
  height: 12px;
  background: rgba(255, 255, 255, .8);
  border-radius: 50%;
  cursor: pointer;
}

.container .focus li.active {
  background: lightcoral;
}

.container .arrow {
  display: none;
  position: absolute;
  top: 50%;
  margin-top: -22.5px;
  width: 28px;
  height: 45px;
  background: url("../images/pre.png") no-repeat;
  opacity: 0.5;
}

.container .arrow:hover {
  opacity: 1;
}

.container .arrow.arrowLeft {
  left: 0;
}

.container .arrow.arrowRight {
  right: 0;
  background-position: -50px 0;
}